摘要:

SUMMARYCarboxyl‐labeled and methylene‐labeled IAA‐14C were applied to the tips of two‐day‐old horizontal pea roots var. Alaska, and the tissue was subsequently halved and counted. In every experiment the lower halves of the subapical 4 mm became more radioactive than the upper halves. With an experimental period not over two hours the upper and lower halves contained an average of 33 and 67 per cent of the total radioactivity in the tissue respectively. Decapitation of the roots at 0.5 mm or more (removal of the entire root cap) prevented the transverse distribution of the applied auxin almost entirely.If the roots were allowed to absorb caffeic acid or 2,4‐dichlorophenol prior to the application of the IAA‐14C, the difference between the amounts of IAA‐14C present on the two sides was greatly decreased.The IAA‐oxidase activity of homogenates made from the lower halves of the apical 3 mm of horizontal roots was less than that of homogenates from the upper halves. Decapitation did not affect this phenomenon.Apparently the unequal distribution of applied auxin and the difference between the activities of the IAA‐oxidase on the two side

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1967.tb00043.x

年代:1967

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1967.tb00044.x

年代:1967

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1967.tb00045.x

年代:1967

数据来源: WILEY

摘要:

SUMMARYAfter cross‐pollination of self‐incompatibleDiplotaxis tenuifoliathe pollen tubes penetrate the wall cuticle of the epidermal papillae and grow inside the cellulose‐pectin layer of the wall towards the base of the papillae. The tubes continue their growth in the middle lamellae of the stigmatic tissue and the intercellular spaces of the stylar transmitting tissue, both of which contain p

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1967.tb00046.x

年代:1967

数据来源: WILEY

摘要:

SUMMARYIn the presence of glucose, the respiration of appendix tissue slices of the arum lilySauromatum guttatumSchott is markedly stimulated by the uncouplers 2,4‐dinitrophenol, Na‐azide and pentachlorophenolafterthe first day of flowering. There is no appreciable effect on the first flowering‐day itself, and only a minor stimulation (if any) at younger stages. These results are interpreted on the basis of the hypothesis that, on the first day of flowering, respiration is of the “uncoupled” type. The relative lack of response to the uncouplers in the young flowering‐stages is probably due to a rapid turnover of ATP in connection with the spectacular growth of the in

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1967.tb00047.x

年代:1967

数据来源: WILEY

摘要:

SUMMARYThe influence of red and blue light on the distribution of growth in excised dark‐grown seedlings ofAvena sativawas studied. The changes in growth distribution seem to be in agreement with the hypothesis that light causes a decrease in transport of auxins from the tip downward, resulting in a higher concentration of auxins in the apical, and a lower concentration in the basal parts of the seedling

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1967.tb00048.x

年代:1967

数据来源: WILEY

摘要:

A. W. Küchler:Vegetation Mapping. VI + 472 pp., 21 fig, 30 tab., $ 15.00. The Ronald Press Company, New York

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1967.tb00049.x

年代:1967

数据来源: WILEY

摘要:

C. D. K. Cook:A monographic study of Ranunculus subgenus Batrachium (DC.) A. Gray. – Mitt. Bot. München6(1966) 47

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1967.tb00050.x

年代:1967

数据来源: WILEY